US2025257213A1PendingUtilityA1
Thermally Conductive Flame-Proof Polycarbonate Compositions Having a High Comparative Tracking Index
Est. expiryApr 14, 2042(~15.7 yrs left)· nominal 20-yr term from priority
C08L 2205/035C08L 2205/025C08L 2203/206C08L 2201/02C08K 2003/2241C08K 5/5399C08K 3/34C08G 64/14C08L 2203/20C08L 2205/03C08K 3/22C08L 23/26C08L 27/18C08L 69/005C08L 69/00
60
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0
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Claims
Abstract
Described are thermally conductive flame-proof compositions which have a high comparative tracking index and contain at least 44.5 wt. % aromatic polycarbonate in which bisphenol TMC is used as a monomer unit, 30 to 40 wt. % talc, 6 to 14 wt. % phosphorus-containing flame retardant, 0.3 to 2.0 wt. % fluorine-containing anti-drip agent, and 1 to 3 wt. % anhydride-modified α-olefin polymer. Said compositions have a high comparative tracking index, thus allowing distances between electrical conductors in electronic and electrical components to be kept shorter than in the past.
Claims
exact text as granted — not AI-modified1 . A thermoplastic composition, containing
A) at least 44.5% by weight of aromatic polycarbonate, wherein the aromatic polycarbonate contains one or more monomer units of formula (1a)
in which
R 1 is hydrogen or a C 1 —to C 4 -alkyl radical,
R 2 is a C 1 —to C 4 -alkyl radical,
n is 0, 1, 2 or 3,
in a proportion of 30% to 65% by weight, based on the total weight of the aromatic polycarbonate,
B) 30% to 40% by weight of talc,
C) 6% to 14% by weight of phosphorus-containing flame retardant, wherein the quotient of the amount of component C, based on the overall composition, and
the amount of component A, based on the overall composition, multiplied by 100, is >10.0,
D) 0.3% to 2.0% by weight of fluorine-containing anti-drip agent,
E) 1% to 3% by weight of anhydride-modified α-olefin polymer,
wherein, if the talc content is <35.0% by weight, the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is at least 35% by weight and wherein, if the talc content is >37% by weight, phosphazene is present as phosphorus-containing flame retardant and the phosphazene content is >10.0% by weight, based on the overall composition.
2 . The thermoplastic composition as claimed in claim 1 , wherein the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is 40% to 60% by weight.
3 . The thermoplastic composition as claimed in claim 1 , wherein the talc content of the thermoplastic composition is 30% to 35% by weight.
4 . The thermoplastic composition as claimed in claim 1 , wherein the amount of fluorine-containing anti-drip agent is 0.4% to 1.0% by weight.
5 . The thermoplastic composition as claimed in claim 1 , wherein the phosphorus-containing flame retardant is a phosphazene or a mixture of different phosphazenes.
6 . The thermoplastic composition as claimed in claim 1 , wherein the anhydride-modified α-olefin polymer comprises maleic anhydride-modified propylene polymer.
7 . The thermoplastic composition as claimed in claim 1 , wherein the composition contains 0.2% to 2.0% by weight of titanium dioxide.
8 . The thermoplastic composition as claimed in claim 1 , wherein, if the talc content is <35% by weight, the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is at least 40% by weight.
9 . The thermoplastic composition as claimed in claim 1 , wherein the quotient of the amount of component C, based on the overall composition, and the amount of component A, based on the overall composition, multiplied by 100, is ≥10.7.
10 . The thermoplastic composition as claimed in claim 1 , containing
A) at least 50% by weight of aromatic polycarbonate, wherein the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is 30-60% by weight, B) 30% to 35% by weight of talc, C) 6% to 12% by weight of phosphorus-containing flame retardant, wherein the quotient of the amount of component C, based on the overall composition, and the amount of component A, based on the overall composition, multiplied by 100, is >10.0, D) 0.3% to 2.0% by weight of fluorine-containing anti-drip agent, E) 1% to 3% by weight of anhydride-modified α-olefin polymer, wherein, if the talc content is <35.0% by weight, the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is at least 35% by weight.
11 . The thermoplastic composition as claimed claim 1 , consisting of
A) at least 44.5% by weight of aromatic polycarbonate, wherein the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is 30-65% by weight, B) 30% to 40% by weight of talc, C) 6% to 14% by weight of phosphorus-containing flame retardant, wherein the quotient of the amount of component C, based on the overall composition, and the amount of component A, based on the overall composition, multiplied by 100, is >10.0, D) 0.3% to 2.0% by weight of fluorine-containing anti-drip agent, E) 1% to 3% by weight of anhydride-modified α-olefin polymer, F) optionally one or more further additive(s), selected from the group consisting of heat stabilizers, antioxidants, mold-release agents, UV absorbers, IR absorbers, impact modifiers, antistats, flame retardants different from component C, optical brighteners, light-scattering agents, hydrolysis stabilizers, transesterification stabilizers, organic dyes, organic or inorganic pigments, compatibilizers, additives for laser marking, wherein, if the talc content is <35.0% by weight, the proportion of monomer units of formula (1a), based on the total weight of the aromatic polycarbonate, is at least 35% by weight and wherein, if the talc content is >37% by weight, phosphazene is present as phosphorus-containing flame retardant and the phosphazene content is >10.0% by weight, based on the overall composition.
12 . A molding consisting of, or comprising a region made from, a thermoplastic composition as claimed in claim 1 .
13 . The molding as claimed in claim 12 , wherein the molding is part of a high-voltage switch, inverter, relay, electronic connector, electrical connector, circuit breaker, a photovoltaic system, an electric motor, a heat sink, a charger or charging plug for electric vehicles, an electrical junction box, a smart meter housing, a miniature circuit breaker, or a busbar.
14 . An EE component, comprising
a first electrical conductor and a second electrical conductor at a first distance d1 and a second distance d2 with respect to one another, which are connected via a thermoplastic composition as claimed in claim 1 , which is in direct contact with the first electrical conductor and the second electrical conductor, wherein the distance d1 is the shortest distance between the first electrical conductor and the second electrical conductor along the surface of the thermoplastic composition and wherein the distance d2 is the shortest distance between the first electrical conductor and the second electrical conductor through the air, wherein d2 is selected in such a way that at the respective operating voltage a sparkover through the air is prevented and wherein d1, at the operating voltage U listed below, is:
d
1
i
(
0
V
≤
U
≤
250
V
)
:
1.8
mm
to
<
2.5
mm
d
1
ii
(
250
V
<
U
≤
500
V
)
=
3.6
mm
to
<
5.
mm
d
1
iii
(
500
V
<
U
≤
1000
V
)
=
7.1
mm
to
<
10.
mm
.
15 . The EE component as claimed in claim 14 , wherein the EE component has an IP6K9K degree of protection according to ISO 20653:2013-02.Join the waitlist — get patent alerts
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